https://charmthirteen.com/blog Long-form writing from charmthirteen on AI systems, founder tools, and vibe coding. en-us https://charmthirteen.com/blog/vibecheck-pressure-test-your-idea https://charmthirteen.com/blog/vibecheck-pressure-test-your-idea Wed, 08 Jul 2026 00:00:00 GMT lex@charmthirteen.com (Lex Hamilton) VibeCheck is an AI thinking partner that stress-tests your startup idea instead of cheering it on. Here is why I'm building it, and how it decides if an idea is worth building.